Addendum to ‘‘Production of flavor-changing gauge bosons fromE6ate+e−and hadron colliders’’: Single production ine+e−annihilation

1989 ◽  
Vol 39 (11) ◽  
pp. 3490-3492 ◽  
Author(s):  
Thomas G. Rizzo
Keyword(s):  
Hadron Colliders ◽  
Gauge Bosons ◽  
Flavor Changing ◽  
Single Production

scholarly journals NEXT-TO-NEXT-TO-LEADING ORDER SOFT AND VIRTUAL CORRECTIONS FOR QCD, HIGGS AND SUSY PROCESSES

2004 ◽  
Vol 19 (06) ◽  
pp. 405-419 ◽  
Author(s):  
NIKOLAOS KIDONAKIS
Keyword(s):  
Top Quark ◽  
W Boson ◽  
Neutral Current ◽  
Leading Order ◽  
Large Transverse Momentum ◽  
Hadron Colliders ◽  
Unified Approach ◽  
Anomalous Couplings ◽  
Flavor Changing ◽  
Flavor Changing Neutral Current

We review recent advances in the calculation of higher-order soft-gluon corrections for a variety of QCD, Higgs, and SUSY processes in hadron colliders. A unified approach and master formulas for next-to-next-to-leading order soft and virtual corrections are discussed. We present some applications of the formalism to top quark pair production at the Tevatron and the LHC, top production via anomalous couplings in flavor-changing neutral-current processes, W boson hadroproduction at large transverse momentum, and charged Higgs production at the LHC.

The Bs0 meson decaying into τe mediated by Z′ gauge bosons

2021 ◽  
pp. 2150167
Author(s):  
J. I. Aranda ◽  
E. Cruz-Albaro ◽  
D. Espinosa-Gómez ◽  
J. Montaño ◽  
F. Ramírez-Zavaleta ◽  
...  
Keyword(s):  
Gauge Boson ◽  
Conversion Rate ◽  
Branching Ratio ◽  
Upper Bounds ◽  
Experimental Results ◽  
The Other ◽  
Experimental Measurements ◽  
Gauge Bosons ◽  
Flavor Changing ◽  
First Time

We calculate bounds for the branching ratio of the [Formula: see text] decay, for the first time, in the context of flavor changing neutral currents mediated by a [Formula: see text] gauge boson, which can arise from five extended models. In this sense, by using experimental measurements on the [Formula: see text] decay and the [Formula: see text] process, we look for constraints of the [Formula: see text] coupling, where the more restrictive bound is offered by the last one. On the other hand, by employing the experimental restriction on the [Formula: see text] decay, the strength of the [Formula: see text] coupling is estimated. Our analysis is based on the more recent experimental results on searches for the [Formula: see text] gauge boson in ATLAS and CMS detectors. In addition, we revisited the [Formula: see text] meson decays by using different approaches not previously reported. The strengths of the [Formula: see text] and [Formula: see text] couplings were estimated by employing experimental restrictions on the [Formula: see text] decay and the [Formula: see text] conversion rate, respectively. Thus, we predict the following upper bounds: [Formula: see text], [Formula: see text] and [Formula: see text].

THE ASSOCIATED PRODUCTION OF THE NEUTRAL TOP-PION WITH A PAIR OF THIRD FAMILY QUARKS AT THE HADRON COLLIDERS

2006 ◽  
Vol 21 (37) ◽  
pp. 2833-2843 ◽  
Author(s):  
XUELEI WANG ◽  
LILI YU ◽  
NAHONG SONG ◽  
WENNA XU
Keyword(s):  
Cross Sections ◽  
The Other ◽  
Tree Level ◽  
Hadron Colliders ◽  
Yukawa Couplings ◽  
The Third ◽  
Flavor Changing ◽  
Associated Production ◽  
Technicolor Model ◽  
The Cross

We study the associated production of the neutral top-pion [Formula: see text] with the third family quarks within the context of the topcolor-assisted technicolor model at the hadron colliders. The studies show that, at the Tevatron, the cross-sections of all these processes are too small to produce enough identified signals. But the cross-sections can be largely enhanced at the LHC. Specially for the processes [Formula: see text] and [Formula: see text], the cross-sections can reach the level of a few hundred fb even a few pb for the light neutral top-pion. With the high yearly luminosity 100 fb-1 at the LHC, over 104 signals can be produced via the above two processes. There exists an ideal flavor-changing mode to detect neutral top-pion, i.e. [Formula: see text], because the SM background of such production mode are very clean. Therefore, we can conclude that neutral top-pion should be observable at the LHC via the processes [Formula: see text] and [Formula: see text]. On the other hand, the statistics available at the LHC via these two processes might be enough to measure the Yukawa couplings [Formula: see text] and [Formula: see text]. Finally, it must be noted that the study of the process [Formula: see text] can give us a good chance to distinguish the TC2 model from the SM and MSSM because there does not exist such similar tree-level favor-changing process in these models.

scholarly journals SUPERSTRING MODELS CHALLENGED BY RARE PROCESSES

1987 ◽  
Vol 02 (03) ◽  
pp. 831-890 ◽  
Author(s):  
B. A. CAMPBELL ◽  
J. ELLIS ◽  
K. ENQVIST ◽  
M. K. GAILLARD ◽  
D. V. NANOPOULOS
Keyword(s):  
Upper Bounds ◽  
Low Energy ◽  
Neutrino Masses ◽  
Dynamical Models ◽  
Gauge Bosons ◽  
Yukawa Couplings ◽  
Flavor Changing ◽  
The Standard Model ◽  
New Interactions ◽  
Matter Fields

Superstring models compactified on Calabi–Yau manifolds contain additional matter fields and gauge bosons beyond those in the Standard Model. The new matter and gauge couplings would make additional contributions to conventional electroweak processes, generate extra flavor-changing neutral interactions, and mediate new interactions leading to proton decay and neutrino masses. We use the phenomenological constraints on such effects to derive upper bounds on Yukawa couplings in low-energy dynamical models inspired by the superstring. We draw attention to the processes which give the best bounds on new Yukawa couplings, and which are those where novel superstring effects might first appear as experimental sensitivity is improved. Our bounds are not sufficient to exclude most superstring models with additional light particles, but do suggest that some couplings are too small to realize certain scenarios for symmetry breaking by radiative corrections.

scholarly journals Effects of the FCNC Couplings in Production of New Heavy Quarks withinZ′Models at the LHC

2016 ◽  
Vol 2016 ◽  
pp. 1-12
Author(s):  
V. Çetinkaya ◽  
V. Arı ◽  
O. Çakır
Keyword(s):  
Cross Sections ◽  
Neutral Current ◽  
Top Quarks ◽  
Heavy Quarks ◽  
Flavor Changing ◽  
Heavy Quark Mass ◽  
Flavor Changing Neutral Current ◽  
Single Production ◽  
The Cross ◽  
Flavor Tagging

We study the flavor changing neutral current couplings of new heavy quarks through theZ′models at the LHC. We calculate the cross sections for the signal and the corresponding standard model background processes. Considering the present limits on the mass of new heavy quarks and theZ′boson, we performed an analysis to investigate the parameter space (mixing and mass) through differentZ′models. For FCNC mixing parameterx=0.1and theZ′massMZ′=2000 GeV and new heavy quark massmt′=700 GeV at the LHC withs=13 TeV, we find the cross section for single production of new heavy quarks associated with top quarks as5.8 fb,3.3 fb,1.5 fb, and1.2 fb within theZη′,Zψ′,ZLP′, andZχ′models, respectively. It is shown that the sensitivity would benefit from the flavor tagging.

scholarly journals Flavor changing heavy Higgs interactions with leptons at hadron colliders

2019 ◽  
Vol 795 ◽  
pp. 371-378 ◽  
Author(s):  
Wei-Shu Hou ◽  
Rishabh Jain ◽  
Chung Kao ◽  
Masaya Kohda ◽  
Brent McCoy ◽  
...  
Keyword(s):  
Hadron Colliders ◽  
Flavor Changing
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